Thirty minutes into a flight from Des Moines, Iowa, to Denver on Dec. 30, an intercom announcement requested medical expertise. Linda Alweiss of Camarillo, Calif., and Amy Sorensen of Casper, Wyo., answered the call. Directed to the cockpit, Alweiss told KTLA in Los Angeles that she found the pilot slumped over and mumbling, with an irregular heartbeat.

A co-pilot safely landed the plane in Omaha, where medics were waiting to further treat the pilot, outlets noted. As the women retreated to their seats, passengers cheered the nurses' efforts, the Star-Tribune wrote. The pilot survived.

In a statement released to media United said: “United flight 1637, a Boeing 737 operating between Des Moines and Denver Monday evening, landed safely in Omaha after the captain became ill. United accommodated the customers overnight, and they continued to Denver the next day.”

A United spokeswoman told The Huffington Post that it was not releasing anymore information on the pilot. She added that she wanted everyone to know "the passengers weren't in any danger."

Sorensen, for one, said her actions weren't really heroic.

"I really don't see myself as a hero," she told ABC News. "I did what I know for a patient that needed it."